Final answer:
The sentence requires a comma after 'Cairo' to separate it from the phrase 'next year.'
Step-by-step explanation:
The sentence 'Darby Steel is considering moving to Cairo next year' requires a comma after 'Cairo' to separate it from the phrase 'next year.' This is because the phrase 'next year' is providing additional information about the time when Darby Steel is considering moving. Therefore, the correct punctuation is: Darby Steel is considering moving to Cairo, next year.
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